Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"labelled compounds"”.
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A generic biokinetic model for C-14 labelled compounds
… This overestimates the dose of all radiocarbon compounds that have been studied. An improved model has been developed that includes and alimentary tract, a urinary bladder, CO2 model, and an "Other" compartment used to model systemic tissues. The model can be adapted to replicate any excretion …
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Studies on the biosynthesis of podophyllotoxin:synthesis of labelled yatein and matairesinol, two potential precursors of podophyllotoxin
… and yatein, a series of stereospecific deuterium-labelled matairesinol and yatein derivatives was proposed and the synthetic methodology for each compound developed. The methodology used to obtain deuterium-labelled compounds can be extended to generating tritium-labelled compounds as well. With …
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Studies on the Efficiency of Energy Conservation in the Initial Stages of Photophosphorylation
… to measure uptake of radioactively labelled compounds, we estimated permeability coefficients for sorbitol, sucrose, and Tris, Tricine, and MOPS buffers and found these compounds to be only slowly permeant. However, incubation of thylakoids in Tricine for one hour allowed enough …
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ΣΥΝΘΕΣΗ ΚΑΙ ΒΙΟΛΟΓΙΚΗ ΜΕΛΕΤΗ ΤΩΝ ΠΑΡΑΓΩΓΩΝ ΤΟΥ 1,8-ΔΙΑΜΙΝΟ-3,6-ΔΙΘΕΙΑ- ΟΚΤΑΝΙΟΥ ΕΠΙΣΗΜΑΣΜΕΝΩΝ ΜΕ ΤΕΧΝΗΤΙΟ-99Μ
… ANALYSIS AND NMR SPECTROSCOPY. THE LIGANDS WERE LABELLED IN AQUEOUS MEDIA WITH TC-99M AFTER ITS REDUCTION WITH NABH4. THEN THE LABELLED COMPOUNDS WERE ANALYZED BY HPLC IN ONE OR MORE 99M TC-SPECIES. THESE WERE FURTHER STUDIED BY ELECTROPHORESIS (CHARGE, IN VITRO STABILITY) AND THEIR LIPOPHILICITY …
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Uptake of kepone by aquatic macrophytes
… the shoot after seven days. Additional ¹⁴C-labelled compounds were detected in shoot and root extracts, indicating possible metabolism of the Kepone molecule by these plants.
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Synthesis of labelled precursors of podophyllotoxin
… Administering various specifically labelled precursors into intact plants and tissue cultures can give a much improved insight into the lignan biogenesis. The first part of the work has been to the synthesis of two diastereotopically labelled with ²H at C-4. Desoxypodophyllotoxin is …
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The Fate of Folic Acid and Related Compounds in the Rat
… and specific radioactivity determinations of compounds derived from oral doses of labelled folates. At doses of 22 and 320ug of pteroyl-L-glutamic acid/ kg, 50 and 25% respectively was absorbed, With doses of 320ug of [214-C]pteroyl-L-glutamic acid/kg, radioactivity was detected in the …
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The Metabolic Fate and Bioactivity of Anthocyanins in Humans
… feeding either (a) 500 mg of isotopically (13C5) labelled anthocyanin or (b) 500 mg elderberry anthocyanins for 12 wks. (3) To explore the impact of acute (500 mg) versus chronic (500 mg/day for 12 wks) anthocyanin consumption on their metabolism and (4) To investigate the anti-inflammatory …
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Lipid Binding in Worked Wheat Flour Doughs
… liquid scintillation counting. The use of these labelled compounds revealed a difference in the behaviour of the free fatty acids compared with the triglycerides. Whereas triolein and tripalmitin showed similar overall binding patterns to the total flour lipids, palmitic acid gradually became …
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Design and synthesis of components for optically active metal-organic frameworks (MOFs) and synthetic routes to diverse deuterium labelled α-diazoacetates, α-diazoacetamides, α-diazoketones, and the antibiotic azaserine
… effective chelating ligand. α-Diazocarbonyl compounds are useful intermediates for various chemical transformations. Although known since the mid-1800s, they still offer an area for future studies and development of preparative methods as well as applications. With the recently growing need …
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Counterion Distribution around a Macroion in Polyelectrolytes Probed by Anomalous Small-Angle X-ray Scattering
… because it obviates the need of using labelled compounds or counterion exchange, as in the case of SANS or conventional SAXS. Scattering experiments performed near the absorption edge of the element under investigation, allow us to obtain the three partial scattering terms predicted by …
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Transport of 5-methyltetrahydrofolic Acid Across the Rat Jejunum
… everted sacs of rat jejunum preloaded with the labelled d-methyltetrahydrofolic acid was stimulated in the presence of mucosal unlabelled 5-methyltetrahydrofolic acid, folic acid, methotrexate and 5-formyltetrahydrofolic acid. Serosal transfer and tissue content of the labelled compounds from …
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Comparison of the biodegradation of pharmaceuticals and biocides in water and soil systems
… antibiotic ciprofloxacin were analysed as model compounds for their turnover in water and soil systems. Isotope labelled compounds (13C, 14C) were incubated in mineral medium (OECD test 301) and in an agricultural soil (OECD test 307). The results revealed the processes responsible for compound …
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Contribution à la synthèse de la [2H11]-adaline
Lorsqu’elles sont attaquées, les coccinelles exsudent de petites gouttelettes d’hémolymphe de l’orifice tibiofémoral de leurs pattes. Chez les coccinelles du genre Adalia, cette sécrétion contient deux alcaloïdes : l’adaline et l’adalinine. Bien que les squelettes de ces deux molécules soient fort …